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A platform for research: civil engineering, architecture and urbanism
Integration of booster heat pumps in ultra-low temperature district heating network: Prototype demonstration and refrigerant charge investigation
https://orcid.org/0000-0003-2830-4156
https://orcid.org/0000-0002-0503-6286
Highlights The performance of 4th generation district heating system with heat pump was experimentally investigated. The coupling effect of district heating and heat pump operations was parametrically studied. Exergy analysis was performed to identify the preferable district heating and heat pump parameters. Design guidelines were proposed for the 4th generation district heating system.
Abstract Decentral booster heat pumps (BHPs) integrated in ultra-low temperature district heating (ULTDH) systems are deemed a sustainable solution for low-carbon building systems. The performance of BHPs is critical for the implementation of ULTDH systems. In this study, we experimentally investigate the effect of refrigerant charge on temperature, pressure, system coefficient of performance (COP), and heating capacity to evaluate the operability and sensitivity of ULTDH. A performance-guaranteed range of refrigerant charge is proposed to ensure the feasibility of the system. We also analyse the component-level exergy destruction and the system-level exergetic efficiency of a BHP prototype. The exergetic efficiencies range from 24.9 % to 33.4 % under operational conditions for ULTDH. The condenser and evaporator's exergy destruction is influenced by the temperature profiles on both sides, suggesting the potential to improve BHP performance by tailoring operating parameters. Additionally, the return water temperature significantly affects the system COP when the domestic hot water supply temperature is fixed. Within the allowable range of return water temperature, BHP operation with high evaporator outlet water temperature can improve the overall efficiency of the ULTDH system.
Integration of booster heat pumps in ultra-low temperature district heating network: Prototype demonstration and refrigerant charge investigation
https://orcid.org/0000-0003-2830-4156
https://orcid.org/0000-0002-0503-6286
Highlights The performance of 4th generation district heating system with heat pump was experimentally investigated. The coupling effect of district heating and heat pump operations was parametrically studied. Exergy analysis was performed to identify the preferable district heating and heat pump parameters. Design guidelines were proposed for the 4th generation district heating system.
Abstract Decentral booster heat pumps (BHPs) integrated in ultra-low temperature district heating (ULTDH) systems are deemed a sustainable solution for low-carbon building systems. The performance of BHPs is critical for the implementation of ULTDH systems. In this study, we experimentally investigate the effect of refrigerant charge on temperature, pressure, system coefficient of performance (COP), and heating capacity to evaluate the operability and sensitivity of ULTDH. A performance-guaranteed range of refrigerant charge is proposed to ensure the feasibility of the system. We also analyse the component-level exergy destruction and the system-level exergetic efficiency of a BHP prototype. The exergetic efficiencies range from 24.9 % to 33.4 % under operational conditions for ULTDH. The condenser and evaporator's exergy destruction is influenced by the temperature profiles on both sides, suggesting the potential to improve BHP performance by tailoring operating parameters. Additionally, the return water temperature significantly affects the system COP when the domestic hot water supply temperature is fixed. Within the allowable range of return water temperature, BHP operation with high evaporator outlet water temperature can improve the overall efficiency of the ULTDH system.
Integration of booster heat pumps in ultra-low temperature district heating network: Prototype demonstration and refrigerant charge investigation
https://orcid.org/0000-0003-2830-4156
https://orcid.org/0000-0002-0503-6286
Highlights The performance of 4th generation district heating system with heat pump was experimentally investigated. The coupling effect of district heating and heat pump operations was parametrically studied. Exergy analysis was performed to identify the preferable district heating and heat pump parameters. Design guidelines were proposed for the 4th generation district heating system.
Abstract Decentral booster heat pumps (BHPs) integrated in ultra-low temperature district heating (ULTDH) systems are deemed a sustainable solution for low-carbon building systems. The performance of BHPs is critical for the implementation of ULTDH systems. In this study, we experimentally investigate the effect of refrigerant charge on temperature, pressure, system coefficient of performance (COP), and heating capacity to evaluate the operability and sensitivity of ULTDH. A performance-guaranteed range of refrigerant charge is proposed to ensure the feasibility of the system. We also analyse the component-level exergy destruction and the system-level exergetic efficiency of a BHP prototype. The exergetic efficiencies range from 24.9 % to 33.4 % under operational conditions for ULTDH. The condenser and evaporator's exergy destruction is influenced by the temperature profiles on both sides, suggesting the potential to improve BHP performance by tailoring operating parameters. Additionally, the return water temperature significantly affects the system COP when the domestic hot water supply temperature is fixed. Within the allowable range of return water temperature, BHP operation with high evaporator outlet water temperature can improve the overall efficiency of the ULTDH system.
Integration of booster heat pumps in ultra-low temperature district heating network: Prototype demonstration and refrigerant charge investigation
Zhu, Tingting (author) / Du, Yanjun (author) / Liang, Jierong (author) / Rohlfs, Wilko (author) / Eric Thorsen, Jan (author) / Elmegaard, Brian (author)
Energy and Buildings ; 298
2023-09-01
Article (Journal)
Electronic Resource
English
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